Add UserPhysicsOptions.xml params to apply global kinematical cuts

Description

Especially on Q2_{min}. Current situation not satisfactory. Medium energy simulations had a hard-coded (Controls.h) minimum Q2 of 1E-4 GeV2. Low energy simulation required overriding that with another Controls.h constant set at 1E-10 GeV2. Electron scattering simulations typically require a much larger cut of ~1 GeV2. Users tweak Control.h and recompile. Global kinematical cuts should be extracted from UserPhysicsOptions.xml. Ideally, different cuts should be
associated with different reaction modes and probes (neutrino, electron)